Integral extrusion forming die and method for thin-walled shell with inner ring rib

Abstract

The invention discloses an integral extrusion forming die for a thin-walled shell with an inner ring rib. The integral extrusion forming die comprises a combined male die, a combined female die, a cushion block, an ejector rod, a fixed assembly and a movable assembly, wherein the combined male die is formed by a shaft sleeve and a mandrel in a guiding and sliding fit mode; the mandrel is connectedwith an independent power output shaft of a hydraulic machine; the combined female die comprises an inner female die body, an outer female die body and a fixed sleeve; and a hollow discharging cavityis formed in the middle of the inner female die body. The invention further provides an integral extrusion forming method for the thin-walled shell with the inner ring rib. The integral extrusion forming method comprises the following specific steps that (1) a sawing machine is adopted for cutting a bar; (2) homogenization treatment is conducted, and a hollow blank is prepared; (3) extrusion forming is conducted on the thin-walled shell with the inner ring rib; and (4) heat treatment and machining are conducted. The integral extrusion forming die is reasonable in structure, the defects of a traditional machining method can be effectively overcome, the technological process is short, the material utilization rate is high, extrusion forming of the inner ring rib can be achieved, and the mechanical property and the bearing capacity of a component are greatly improved.

Description

technical field [0001] The invention relates to the technical field of precision plastic forming of metal materials, in particular to an integral extrusion molding die and method for a thin-wall shell with inner ring ribs. Background technique [0002] Thin-walled shells with inner ring ribs are widely used in transportation, aerospace, weaponry and other fields, and need to meet the requirements of high load and high mechanical properties. At present, such components often use casting forming, welding forming, spinning forming, traditional extrusion forming and machining. Casting is used, although the overall shell can be formed and the material utilization rate is high, but due to the influence of casting defects such as pores and shrinkage porosity, the qualified rate of parts is low and the mechanical properties are poor, which cannot meet the design requirements of high-performance components; Body forming + welded ribbed shell, the weld strength is only 60%-70% of the...

AI Technical Summary

Problems solved by technology

Casting is used, although the overall shell can be formed and the material utilization rate is high, but due to the influence of casting defects such as pores and shrinkage porosity, the qualified rate of parts is low and the mechanical properties are poor, which cannot meet the design requirements of high-performance components; Body forming + welded ribbed shell, the weld strength is only 60%-70% of the material strength after heat treatment, the bearing capacity and protection capacity are poor; using spinning forming ribbed shell, a large number of auxiliary processing tools and parts need to be designed The production cycle is long, and the spinning equipment is expensive, the height of the formed ring rib is limited, and the quality of the ring rib cannot meet the requirements; after the simple blank is prefabricated by traditional extrusion molding, a large number of mechanical processing is used to form the shell with inner ring rib, and the material utilization rate is low , the cost is high, and the metal flow line is cut off by machining, the bearing capacity of the component is greatly reduced

[0003] In summary, traditional processing and forming methods are difficult to meet the actual needs of high-performance thin-walled shells with inner ring ribs, resulting in a huge contradiction between supply and demand

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